Study On Synthetic Process And Catalytic Reaction Characteristics Of Environment-friendly Plasticizers

Plasticizer has been one of the largest plastics processing aids in production and consumption. But as countries around the world increasingly emphasize environmental awareness, pharmaceutical and food packaging, daily necessities, toys and other plastic products have put forward higher purity and health requirements for the main plasticizer(DOP).Produced a series of environment-friendly plasticizers, including epoxy fatty acid methyl ester(EFAME) with its unique environmental protection, renewable and excellent plasticizing performance can truly find its place in the plasticizer. But the literature are used in a two-step method, namely synthetic organic acid peroxide in advance, and then epoxidized the fatty acid methyl ester use it.The method step tedious, and exist explosion danger in the actual production.In addition, EFAME resistivity is not ideal, but if compound with environmental protection plasticizer diisooctyl terephthalate(DOTP), the performance can be improved obviously.But DOTP synthesis reaction has self-defect, such as takes a long process, and research is almost stagnant, continue to break through.Therefore, this research use plant oil fatty acid methyl ester as raw materials, Studied the method of synthetic EFAME through in-situ method, and studied the method of improving the process of DOTP synthesis rate, finally discussed mixing plasticizing properties of EFAME and DOTP in this paper, the main content and research results are summarized as follows:1. Studied the method of synthetic EFAME through in-situ method.Using alkali as catalysis, preparation of soybean oil into fatty acid methyl ester and through GC(GC- MS) analysis of its composition and its content, and then determine the ratio of material. Through the two-step method and the in-situ synthesis EFAME, use the infrared(IR) analysis product, and finally discuss the best synthesis process by orthogonal experiment.The optimum technological conditions were: fatty acid methyl ester 50 g, formic acid 6.94 g,H2O2 42.15 g, reaction temperature at 65 ℃, reaction time is 4 h, epoxy value is 6.23.Compared with the two-step method,it has higher rate of cyclization, plasticizing effect is better;2. Studied the improved process of DOTP. Studied the reaction temperature, reaction time, raw material ratio, reaction pressure and catalyst, and examine the nature of the parameters, then concluded the best synthesis process; Moreover studies indicate that use PTA, produce DOTP, PTA turned into monoester first, then this monoester turned into DOTP, and the latter speed is faster than the former; Reduce the size of PTA can improve reaction speed; Adding octanol quantity can reduce the reaction temperature effectively; At the beginning of the reaction increase the pressure can promote heat up, At the end of the reaction reduce stress can reduce the reaction temperature and promote water generated, improve the reaction rate consequently; Tetrahydronaphthalene Can effectively promote reaction rate, when removing octanol Tetrahydronaphthalene can been removed at the same time, don’t remain in the product; the activation energy of single-catalyst reaction is 95.52 k J/mol, and the activation energy of bimetallic catalyst is 88.89 k J/mol, it’s lower than the single-catalyst obviously. And the reaction time reduced from 200 min to 110 min, and final temperature is 224℃ only;3. Study the mechanical property of DOP, DOTP, EFAME and complex plasticizers(EFAME and DOTP).The results show that the EFAME plasticizing effect is best, but the lightning is lowest, and the resistivity is not ideal.But this just is the advantages of DOTP, both through distribution can achieve the effect of plasticizer DOP, it isn’t affect the plastic and use, and make up for the deficiency of the EFAME, expand the use of space environmental protection plasticizer.